What tacticus said: disable SSL 2. But there's nothing wrong with the web server. (Also, given that you're using IIS, it's unusual that TLS 1.1 and 1.2 are not

What tacticus said: disable SSL 2. But there's nothing wrong with the web server. (Also, given that you're using IIS, it's unusual that TLS 1.1 and 1.2 are not enabled.)